Final answer:
After a piece of wood has burned and turned to ash, the total mass does not change.
Step-by-step explanation:
The correct example of the Law of Conservation of Mass is:
After a piece of wood has burned and turned to ash, the total mass does not change.
According to the law, matter cannot be created or destroyed in a chemical reaction. In the case of burning wood, the mass of the ashes is equal to the mass of the wood before it burned, even though the wood has transformed into a different form.